public class IntegerTest02 {

    public static void main(String[] args) {
        int i = Integer.parseInt("123");
        System.out.println(i);

        String s2 = i + "";
        System.out.println(s2+1);

        Integer x = 100;
        int y = x;
        System.out.println(y);

        Integer k = Integer.valueOf("1234");
        System.out.println(k);

        String e = String.valueOf(k);
        System.out.println(e);
    }
}
